linux-kernel - Re: BUG: soft lockup

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Message-ID: <20081230042333.GC27679@wotan.suse.de>
Date:	Tue, 30 Dec 2008 05:23:33 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Roman Kononov <kernel@...onov.ftml.net>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com
Subject: Re: BUG: soft lockup - is this XFS problem?

On Tue, Dec 23, 2008 at 12:12:59PM -0500, Christoph Hellwig wrote:
> 
> Nick, I've seen various reports like this by Roman.  It seems to be
> caused by an interaction of the lockless pagecache with the xfs
> I/O code.  Any idea what might be wrong here:

Hmm, it could get into a loop here if there is a page in the pagecache
with a zero refcount, which might be a problem with XFS... other looping
conditions might indicate a problem iwth lockless pagecache or radix
tree. It would be very helpful to know what condition it is looping on...

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